Abstract: An auditory jack includes a casing protected inside a metal shell and having an internally threaded metal socket on one end extended out of the metal shell through a hole for receiving the plug of an audio output device, an inside space divided into a plurality of troughs by a plurality of projecting blocks, into which two movable terminals and two fixed terminals are respective inserted, and a plurality of columns respectively made inside each trough and fitted into a respective round hole on a cover for permitting the cover to be firmly retained to the casing, which movable terminals each has an opposite end respectively formed into a springy triangular strip for electrically connecting the plug being threaded into said metal socket and for permitting the respective movable terminal to be able to return to a former shape after being pressed by the plug.

Abstract: A bus connector comprising a base, an upper shell and a terminal unit, wherein said upper shell has resistor chambers for holding resistors from a bus and an elongated board at the front bottom edge thereof which is tightly pressed on the bus main track to which the connector is connected to seal off dust, and wherein said terminal unit has four terminals made in the same shape and respectively retained in four parallel grooves on the bottom edge of the base.

Abstract: A base-bar type electrical connector, comprised of a base, an electrical contact assembly, a ribbon cable fastener and a stress eliminator. The electrical contact assembly is comprised of a plurality of conductors fastened in the base at the bottom with forked terminals projecting over the top surface of the base so that a ribbon cable can be placed thereon and squeezed by the ribbon cable fastener to force the forked terminals to pierce through the ribbon cable permitting the conductors in the ribbon cable to electrically retained at the fork of the forked terminals. The stress eliminator has two hook portions respectively hooked up with the base at two opposite ends so as to firmly secure the ribbon cable fastener to the base against any possible stress. The base has a dovetail groove at the bottom conveniently for mounting on a bus-bar main track through dovetail joint to electrically connect the ribbon cable to a bus-bar.